F?re R (1988). “Efficiency Gains from Addition of Technologies: A Nonparametric Approach.” in Eichhorn W (eds.) Measurement in Economics 20, Physics-Verlag: 171-176.

F?re R (1988). “Efficiency Gains from Addition of Technologies: A Nonparametric Approach.” in Eichhorn W (eds.) Measurement in Economics 20, Physics-Verlag: 171-176.

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